31results about How to "Shorten the transient" patented technology

An electrical network for an aircraft. The aircraft includes at least one variable pitch propulsor. The electrical network includes a wound field synchronous AC electrical generator having a wound rotor driven by an internal combustion engine. The network further includes a voltage regulator configured to regulate output voltage of the electrical generator by regulating rotor winding magnetic field strength, and a synchronous AC drive motor coupled to a respective variable pitch propulsor and provided with power from the output of the electrical generator.

The present invention is an electric vehicle power system that uses multiple permanent magnet motor / generators connected in series or parallel and multiple battery step switching. Motor, torque and speed are controlled by steps in series connection and then in parallel connection. Smooth acceleration, regeneration and current control are provided by delaying stepping from one battery step to the next until the next step is fully engaged. Transients are limited to the effect of one battery step by using rectifier shunt switching. Multiple motors provide acceleration torque at low speed in series connections and at cruising speeds in parallel connection. Regenerative deceleration is provided in the opposite manner. Battery depletion is averaged by flipping ends of a battery bank. Controls are provided with normal foot controls and a speed setter. A separate deceleration pedal or lever may be used.

The present system and methods enable simultaneous momentum dumping and orbit control of a spacecraft, such as a geostationary satellite. Control equations according to the present system and methods generate accurate station-keeping commands quickly and efficiently, reducing the number of maneuvers needed to maintain station and allowing station -keeping maneuvers to be performed with a single burn. Additional benefits include increased efficiency in propellant usage, and extension of the satellite's lifespan. The present system and methods also enable tighter orbit control, reduction in transients and number of station-keeping thrusters aboard the satellite. The present methods also eliminate the need for the thrusters to point through the center of mass of the satellite, which in turn reduces the need for dedicated station-keeping thrusters. The present methods also facilitate completely autonomous orbit control and control using Attitude Control Systems (ACS).

An Optical Transport Network (OTN) transient management method, OTN node, and OTN network includes operating an OTN connection in a first mode in a network, the OTN connection traverses at least two nodes in the network, requesting a change in the OTN connection to a second mode which will cause a network transient, the change includes a timing change on the OTN connection affecting the at least two nodes, and performing transient management at the at least two nodes to mitigate the network transient, the transient management prevents spurious alarms due to the change between the first mode and the second mode.

An Optical Transport Network (OTN) transient management method, OTN node, and OTN network includes operating an OTN connection in a first mode in a network, the OTN connection traverses at least two nodes in the network, requesting a change in the OTN connection to a second mode which will cause a network transient, the change includes a timing change on the OTN connection affecting the at least two nodes, and performing transient management at the at least two nodes to mitigate the network transient, the transient management prevents spurious alarms due to the change between the first mode and the second mode.

Multilevel voltage arrangement having a transformer and a power converter or inverter comprising one or more common DC links connectable to a power source, said arrangement comprising one first set of H bridges being connected to said common DC link, wherein each of said H bridges comprises with at least two nodes connected to the ends of wirings at the primary side of a transfer, wherein control means are configured for controlling H bridges so as to achieve a multilevel voltage signal between the first node and the second node of said H bridges.

An improved control arrangement is used in a high power rectifier and comprises two or more power controllers ganged together in parallel. Each power controller rectifies an AC voltage signal using zero voltage crossing switching to produce a binary switched signal and each power controller is connected to an independent connectable load. Each power controller includes a fast acting binary power switch that selectively connects the respective independent connectable load to the rectified AC voltage signal. The control arrangement selectively activates the power controllers to define a desired connected load. This high power rectifier and control arrangement is advantageously used to provide fast up down power regulation to a grid by selective storage of thermal energy and deriving power from the thermal energy storage system to add fill in power to the grid.

In a method of operating a gas turbine during shut down, the gas turbine is decelerated and closure of compressor inlet guide vanes (1) is initiated at a shaft speed at least 5% above the shaft speed where a vibration peak occurs. The compressor inlet guide vanes (1) are closed by an angle in the range from 15°-35°, preferably at a rate between 5° and 10° per second. The method effects a reduction of the risk of rotational stall.

A voltage regulation circuit intended to generate a regulated voltage for an electronic device, comprising: a transconductance amplifier based on a pair of MOS type differential amplifiers, said amplifier having a first input onto which a reference potential is applied and a second input onto which a counter reaction of said regulated voltage is input; a follower stage connected to the output from said transconductance amplifier; a MOS type transistor that will be used to make the output stage of the regulation circuit with a source connected to a first power supply potential. The transconductance amplifier comprises a resistive load 360 with a profile in K / gm, where gm is the transconductance coefficient of said input differential pair, said resistive load being connected to said first power supply potential.

An electrical network for an aircraft. The aircraft includes at least one variable pitch propulsor. The electrical network includes a wound field synchronous AC electrical generator having a wound rotor driven by an internal combustion engine. The network further includes a voltage regulator configured to regulate output voltage of the electrical generator by regulating rotor winding magnetic field strength, and a synchronous AC drive motor coupled to a respective variable pitch propulsor and provided with power from the output of the electrical generator.

A voltage regulation circuit intended to generate a regulated voltage for an electronic device, comprising: a transconductance amplifier based on a pair of MOS type differential amplifiers, said amplifier having a first input onto which a reference potential is applied and a second input onto which a counter reaction of said regulated voltage is input; a follower stage connected to the output from said transconductance amplifier; a MOS type transistor that will be used to make the output stage of the regulation circuit with a source connected to a first power supply potential. The transconductance amplifier comprises a resistive load 360 with a profile in K / gm, where gm is the transconductance coefficient of said input differential pair, said resistive load being connected to said first power supply potential.

Digital audio circuitry including modulation circuitry (35; 135) for generating a pulse-width modulated (PWM) signal from processed pulse-code modulated (PCM) audio signals. The modulation circuitry includes a duration quantizer function (32) that generates a sequence of duration values d(k) from received PCM samples, quantized to integer multiples of periods of a master PWM clock (CLKpwm). The duration quantizer function also produces a feedback PCM value x(k) from each quantized duration value d(k) that is applied to a loop filter (36), the output of which modifies the received PCM sample stream to suppress quantization noise. Transient effects caused by modulation or abrupt changes in the desired PWM period are suppressed by digitally filtering (34; 134) the PWM period sample stream.

A control system and method of predicting how a machine will respond to occasional or periodic service, and adjusting the machine accordingly to account for the change in machine behavior due to the service, mitigates transients in machine performance. A prediction of the service effect is fed forward to the existing control system just prior to the occurrence of service in order to compensate for the service effect. This prediction is continually updated and refined using subsequent measurements of the effect of service on machine performance. More specifically, a controller monitors the process output variables indicative of the machine performance and adjusts machine inputs to achieve a desired level of machine performance. The controller monitors the process output variables indicative of the machine performance prior to, during, and immediately after the service and adjusts the machine inputs to compensate for the transients.

During operation, the DC converter and a DC battery charger controller in a charger circuit transitions from a first error signal to a second error signal for use in charging a battery, wherein the first error signal and the second error signal, respectively, correspond to feedback sources in a plurality of feedback sources with a plurality of feedback sources. Then, the DC converter and a DC battery charger controller selects a gain and an impedance to ground of a damping circuit based on the selected second error signal, where the damping circuit applies the gain and the impedance to ground to the second error signal. Moreover, the DC converter and a DC battery charger controller selects one or more clamping voltages of a voltage-clamping circuit based on the selected second error signal, where the voltage-clamping circuit applies the one or more clamping voltages to an output from the damping circuit.

This invention relates to a vacuum breaker of a solid-sealed outdoor high voltage phase controlled synchronous permanent magnet unit, in which, three insulation shells in the same internal structure are fixed on the upper end of the base, a permanent magnet is fixed at the bottom of the insulation shell, one end of the power output shaft of the magnet unit is connected with a high strength insulation pull rod, the other end of the rod is hinged on the moving touch rod of a vacuum quenching chamber fixed on a low line end by soft connection, the quenching chamber is fixed on the top of the shell, the static contactor of the quenching chamber is fixedly-connected with the upper inlet wire end cover electrically, a fixed frame is set at the bottom of the base, a control box is fixed on the frame with PLC, CPU single-chip processor, current and voltage phase detector and a controller electrically connected with the coil of the magnet unit.

The present invention takes the form of a system that may reduce the effect of a transient of a fuel system. Essentially, an embodiment of the present invention incorporates a pressure control cell (PCC) with the fuel system. The PCC may be considered an additional volume that removes some of the fuel remaining in the fuel system during a transient event. During a transient event, when a rapid reduction of fuel is required for a fuel circuit, fuel may be allowed to exit a manifold of the fuel system and enter the PCC. This fuel may now be stored within the PCC and may no longer be available to the combustion can. A benefit of the present invention may be a reduced possibility of an undesired increase in rotor speed, and a lean blowout event.

An improved control arrangement is used in a high power rectifier and comprises two or more power controllers ganged together in parallel. Each power controller rectifies an AC voltage signal using zero voltage crossing switching to produce a binary switched signal and each power controller is connected to an independent connectable load. Each power controller includes a fast acting binary power switch that selectively connects the respective independent connectable load to the rectified AC voltage signal. The control arrangement selectively activates the power controllers to define a desired connected load. This high power rectifier and control arrangement is advantageously used to provide fast up down power regulation to a grid by selective storage of thermal energy and deriving power from the thermal energy storage system to add fill in power to the grid.

It is disclosed a technique in which Controlled Switching Devices (CSDs) are used to control medium and high voltage circuit breakers to mitigate switching transients. This invention describes a method for controlling the closing of a circuit breaker to mitigate and / or eliminate the inrush current in capacitive loads such as capacitor banks and filters by taking into account the residual DC voltage charges that may be present in the load. It is disclosed a method to perform fast switching operations on capacitive loads and therefore eliminate the load discharge period.

In a method of operating a gas turbine during shut down, the gas turbine is decelerated and closure of compressor inlet guide vanes (1) is initiated at a shaft speed at least 5% above the shaft speed where a vibration peak occurs. The compressor inlet guide vanes (1) are closed by an angle in the range from 15°-35°, preferably at a rate between 5° and 10° per second. The method effects a reduction of the risk of rotational stall.

An operating method for an externally heated once-through steam generator, in particular a once-through steam generator is heated using solar thermal energy and has a steam turbine connected downstream of the once-through steam generator. A pressure regulation device, having at least one turbine valve for regulating the pressure, is arranged in the feed water-steam circuit between the once-through steam generator and the steam turbine, the pressure regulation device being controlled by a control unit in such a way that, in the event of sudden load reductions, the drop in pressure associated therewith occurs, in a time delayed manner, by throttling of the at least one turbine valve.

A circuit, method, and system for producing artificial ambience effect for an input audio signal, mono, stereo, or surround. The ambience effect enhances artificial reverberation, replaces artificial reverberation, or synthesizes extra audio channels, such as surround channels. The circuit may include a transient reduction module and a reverberation filter. The transient reduction module may be adapted to reduce transients in an input audio signal of one or more channels. The reverberation filter maybe adapted to receive a transient-reduced signal of one or more channels corresponding to the transient-reduced signal.

The invention discloses a wind turbine generator set performance-guaranteeing maximum wind energy capturing method based on BLS and a double-layer SMC. The method includes solving a control target forrealizing maximum power tracking of the wind turbine generator; calculating a maximum power tracking error according to an effective wind speed estimation value given by a wind speed estimation modelbased on the BLS; designing the upper and lower bounds of the maximum power tracking error, converting the constrained maximum power tracking error into an unconstrained variable, solving the dynamiccharacteristics of the unconstrained variable, and designing a control signal expression and a control gain updating rate according to the double-layer SMC principle. The method is low in implementation cost, system overshoot and tracking errors can be reduced; meanwhile, the transient and steady-state performance of the system is guaranteed, the mechanical load of a unit transmission chain system can be reduced, the failure rate is reduced, the service life of the unit is prolonged, the implementation process is simple, the practicability is good, and compared with a traditional optimal torque control algorithm, the unit productivity can be improved, and the economic benefits of a wind power plant are increased.

An aircraft power supply for providing DC power with improved power quality characteristics to the aircraft. According to one embodiment, the aircraft power supply includes an input filter, a step-down transformer, one or more rectifier networks, and an output filter with a voltage modulation attenuator to passively improve power quality characteristics. The voltage modulation attenuator may use a certain arrangement of inductors, capacitors and diodes to reduce voltage transients in the aircraft power supply.

The invention relates to a prefabricated bin for a high-voltage SF6 phase angle control switching breaker. A box is divided into a plurality of compartments, namely an incoming line compartment, a PT (potential transformer) compartment, at least one capacitor compartment, at least one inductor compartment, a transformer compartment and a control chamber. The prefabricated bin is simple in structure, small in occupied area, capable of realizing workshop assembly, low in cost, and convenient to use, maintain and overhaul.

It is disclosed a technique in which Controlled Switching Devices (CSDs) are used to control medium and high voltage circuit breakers to mitigate switching transients. This invention describes a method for controlling the closing of a circuit breaker to mitigate and / or eliminate the inrush current in capacitive loads such as capacitor banks and filters by taking into account the residual DC voltage charges that may be present in the load. It is disclosed a method to perform fast switching operations on capacitive loads and therefore eliminate the load discharge period.

The invention discloses a medium-voltage phase selection closing switch, which comprises an intelligent phase selection controller and a medium-voltage phase selection closing switch. The intelligentphase selection controller and the medium-voltage phase selection closing switch are connected through a cable. The medium-voltage phase selection closing switch is formed by a frame, vacuum arc-extinguishing chambers, upper insulation structural members, insulation pull rods, lower insulation structural members and permanent magnet operating mechanisms. Each vacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller. Eachvacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller; and the medium-voltage phase selection closing switch is easy to operate, long in life and high in action reliability.

The arrangement (5) is designed as a gradual limiter and filter circuit to limit that input voltage at a connection pin (16) of an IC (1). The arrangment is electrically connected to the connection pin(16).

The invention discloses an MPPT method based on SVR and SMC for a wind turbine with preset performance. Find the control target for wind turbines to achieve maximum power tracking, calculate the maximum power tracking error based on the effective wind speed estimate given by the SVR-based wind speed estimation model, and use the error conversion technology to convert the constrained maximum power tracking error into an unconstrained variable, The dynamic characteristics of unconstrained variables are obtained, and the control signal expression and control gain expression are designed according to the SMC principle. This method avoids the dependence on the unknown dynamic prior information of the system and the use of expensive lidar wind measuring devices, the implementation cost is low, and the transient and steady-state performance of the system can be guaranteed at the same time. The design process is simple and can reduce large turbulence The impact of the overshoot on the system requires less control parameters to be debugged, and the implementation process is simple. Compared with the traditional optimal torque control algorithm, it can increase the production capacity of the unit and increase the economic benefits of the wind farm.

The invention discloses a doubly-fed wind power generator fault voltage ride-through control method and system, comprising: obtaining the three-phase current of the doubly-fed wind power generator rotor, and obtaining the DC component after coordinate transformation of the three-phase current; and obtaining the DC component according to the dynamic voltage command value The d-axis current command value; the q-axis current command value is obtained based on the active power command value of the maximum wind energy tracking control; the modulation signal is obtained by adjusting the DC component, the d-axis current command value and the q-axis current command value through the current loop, and the rotor is generated according to the modulation signal The driving signal of the switch tube of the side converter is used to control the fault voltage ride-through of the doubly-fed wind turbine. It can dynamically change the control voltage command value to realize the reactive power exchange between the wind turbine and the grid, and improve the high and low voltage fault ride-through capability of the double-fed asynchronous wind turbine DFIG.